forked from boostorg/preprocessor
49 lines
1.4 KiB
HTML
49 lines
1.4 KiB
HTML
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<html>
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<head>
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<title>BOOST_PP_TUPLE_EAT</title>
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<link rel="stylesheet" type="text/css" href="../styles.css">
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<script language="javascript" type="text/javascript" src="../scripts.js"></script>
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</head>
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<body onload="init('sample');">
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<div style="margin-left: 0px;">
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The <b>BOOST_PP_TUPLE_EAT</b> macro expands to a macro that eats a <i>tuple</i> of the specified size.
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</div>
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<h4>Usage</h4>
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<div class="code">
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<b>BOOST_PP_TUPLE_EAT</b>(<i>size</i>)
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</div>
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<h4>Arguments</h4>
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<dl>
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<dt>size</dt>
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<dd>
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The size of the <i>tuple</i> to be eaten.
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Valid <i>tuple</i> sizes range from <i>0</i> to <b>BOOST_PP_LIMIT_TUPLE</b>.
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</dd>
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</dl>
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<h4>Remarks</h4>
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<div>
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The <i>size</i> argument must be the actual size of the <i>tuple</i>.
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</div>
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<h4>See Also</h4>
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<ul>
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<li><a href="limit_tuple.html">BOOST_PP_LIMIT_TUPLE</a></li>
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</ul>
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<h4>Requirements</h4>
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<div>
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<b>Header:</b> <a href="../headers/tuple/eat.hpp.html"><boost/preprocessor/tuple/eat.hpp></a>
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</div>
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<h4><a class="local" onclick="toggle('sample');" onmouseover="change(this);" onmouseout="revert(this);">Sample Code</a></h4>
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<div id="sample"><pre>
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#include <boost/preprocessor/control/if.hpp>
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#include <boost/preprocessor/tuple/eat.hpp>
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#define OP(a, b) (a b)
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#define MACRO(n) BOOST_PP_IF(n, OP, BOOST_PP_TUPLE_EAT(2))(1, 2)
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MACRO(0) // expands to nothing
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MACRO(1) // expands to (1, 2)
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<pre></div>
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</body>
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</html>
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